You are right Sinan Ibaguner The relationship between employability and university graduate diplomas is low.
Employability refers to your ability to gain initial employment, maintain employment, and obtain new employment if required.
In this sense, the first link (8 ways…) is helpful !
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Despite all the seeming demand for experts in the sciences, cuts in research spending and belt-tightening at universities mean that only one in five Ph.D.s in science, engineering and health end up with faculty teaching or research positions within five years of completing their degrees. Top Ph.D. graduates in some fields, like engineering, can be snapped up by private industry. But it varies by discipline.
For example, biomedical postdocs — according to the National Institutes of Health (US), there may be as many as 68,000 of them — are clogging a job market that almost certainly can't absorb them all.
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Conclusion:
It is not only a matter of good vs. worse schools, but of being predominantly trained as a one-track specialist, i.e. academic research assembly line versus outside (real world) job market.
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PS.
World famous economist Ludwig von Mises confessed himself that he learned to boil an egg only, when he had to emigrate to the US in 1940.